I didn’t know  ________.

— Must we get to the airport before 8 o’clock?

— No, you _____. The plane takes off at 12 o’clock.

A．mustn’t          B．needn’t          C．wouldn’t         D．shouldn’t

I hate travelling by air__________ you usually have to wait for hours before the plane takes off.

A.because    B.though                 C.until                               D.unless

Remember to         your mobile phone when the plane takes off.　　

A. turn on       B. turn down       C. turn off　　

—Dad, would you please drive  ?

— No hurry. We have enough time before the plane takes off.

A. faster                             B. more slowly                  C. more carefully